One work around could be to leave the label blank and position text fields at the beginning.
Another to add at the end of some label looks better but not perfect (see Schlafen).
Both methods are cumbersome - a label length would be perfect.
Thanks for your help!
I removed the > but width does not work. I use now "min-width" and removed the "child.." to get it for all children. That works fine now.
One more question: I use widget in group to limit scope to that group. Are there any disadvantages compared to adding it to the side head?
That might have been due to specificity (i.e. had you added !important to the css entry, it may have worked). Having the extra > was the real issue.
It doesnt matter where the CSS is - the selector performs the "scoping" e.g. having #HzZeitbegrenzt_Temperaturen_anpassen_cards > in the selector limits the affect to children of #HzZeitbegrenzt_Temperaturen_anpassen_cards - so all you are doing is effectively placing the CSS somewhere other than head.
You are right. I tried the width again and it works (even without important)
I guess I got confused with the apostrophe or colons - trying to much different things.
Thanks a lot for your help. I modified now also the ballons - they are not anymore overlapping with the upper slider or marker (marker removed) (update 2020-11-19)